Installation Checks And Functional Tests - Siemens 3AH3 Instruction Manual

Installation checks
and functional tests
Introduction
This section provides a description of the
inspections, checks and tests to be
performed on the circuit breaker operator
module only.
Inspections, checks and tests without
control power
Vacuum circuit breakers are normally
shipped with their primary contacts OPEN
and their springs DISCHARGED. However, it
is critical to first verify the DISCHARGED
condition of the spring-loaded mechanisms
after de-energizing control power.
Hazardous voltage and high-speed moving parts.
Will cause death, serious injury and property damage.
Read instruction manuals, observe safety instructions and use qualified
personnel.
De-energizing control power in
switchgear
When the circuit breaker is mounted in
switchgear, open the control-power
disconnect device in the metal-clad
switchgear cubicle, outdoor circuit breaker
housing or other location.
In metal-clad switchgear, the control-power
disconnect device is normally located on the
secondary-device panel in the upper cell of
the vertical section. The normal control-
power disconnect device is a pullout-type
fuse holder. Removal of the fuse holder
de-energizes control power to the circuit
breaker in the associated switchgear cell.
In some switchgear assemblies, a molded-
case circuit breaker or knife switch is used in
lieu of the pullout-type fuse holder. Opening
this circuit breaker or switch accomplishes
the same result: control power is
disconnected. Opening this circuit breaker
or switch accomplishes the same result:
control power is disconnected.
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